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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57b526b4de1a37fdd740bcc9fdc2960fa8df2a55b49c0c442c09f78e3090809' 
  AND token = 'J0Fonl6BvE4J3hJiY0I9ajUjTUGUjcl3G2hAa9iKYfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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