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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c8cd855e570bf348447625cf6ce2a5ca27f3fb6a9ac00153e5b9005be69fe3' 
  AND token = 'EcTSFxoPtFUa5l8ZDGjsltww0Zpuo8pPYhNLFd8HaLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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