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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08027c6d219bc112b1c454e26bdcfb68698b625efb6ad2eea5ade9b400acf96d' 
  AND token = 'ZvkLu/SU6jvyOtCVssFE71NaW9Y8gDAGgj3I5zX3S88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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