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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c10f45806b964f524b64f86dcd5aadf32a5c3504a55e5aeafa3a007e9e4fe7' 
  AND token = 'm6mvO2mP3rB6v3yV1rK5Izxv/9fDZAZcUo3ZXASh5ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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