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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61380ed02517c0d26036c2f98c484dc3607257ea8067d50476628edfd1ed1e81' 
  AND token = 'MI9H4G2O3HP1Zu/ZCMkWGtXC4+F5pNduNPYsPZp1x0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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