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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c627fdc9ffd701dab4b13681ec2ff859c601efe05c35dc16db21870d0c5e9beb' 
  AND token = 'LPVomdZZ54nuhO/eKbYo7j1en3G18xZ01Q6eeX+PP30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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