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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344a57033afe5572e60ff761508b9f254dd163cf0e7bcfa4b5def93c26aa9fbd' 
  AND token = 'YvyUeG1+aWhV5Lw5l8Wis80cBpP8p13603l2xiZPLI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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