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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020d4cc3e3fe4e74ea5d604b00a366ab71011e3a54874b87c426ea43a09fa303' 
  AND token = '3zeonFQaxMKvU95ktB1QcWBqF2xUfA/OuvJdyJhM6AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}