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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee669c1ac85c1b9880c2576679b029f2dfb1541e0e634e82f0e1990d49d2914' 
  AND token = 'xDXxvENsLtWCXr8phf4G4wjkqfBfypIzSHZ0n9W4RWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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