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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044add27e8e9890077de078b074077b1efa50d28e9830263b59d8e6ac5d14b07' 
  AND token = 'Pe1AhWpJB2vCz0kTPfwnh+XuGYS21CA1//ChSWXAmqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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