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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06986a39ab1b6801ed20868aa63a9671eda34af0b4da37f1912accdc3b1c9b2' 
  AND token = 'AjnBSrCnCOqSiF9SpKyP75KnJGYVYS9EZ9o1W6ISYlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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