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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a57be9da22ba7a7016b1c858fd50e936e807f1c43afd1a5bd9dcc5d066d8d6' 
  AND token = 'kwiCwmnd6k9ECGjsabmZveCgtn2vOb7G4h3flFophDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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