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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04004524f06f49b187e89e9027e3bf7d8300814c09eea53b8acb5b9d6dd9f57' 
  AND token = '7qOIYys1OO6BGIacO8rhhSOUIPFQcNSrYfiHhyXe6SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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