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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54406790684ae019ffa7cac57e0937f512728eb98b54c05b2985b52aa213939' 
  AND token = 'BKhzGKUr4K+jUe54JsUQ08XwKC83pSDx/tHldXscy7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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