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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7147d9a34ef669d8883c73e815d4dac02ac785c5b6907a0c8670d5862e97cff0' 
  AND token = 'ABnBX9nNqnO2zuu5bxR2a0biN6R3BjZtTxLIZdvoClc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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