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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bec031fbc59b5ae21f4ff2659ce9c950a0ba70fec8e654d638f8b61ce3bac5e' 
  AND token = 'IsvmXbxtUnPi7MGfvJmfaWTyHwR3fRW7DZ7iKmGCAwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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