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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8e85e2f84c44e9919ca8ba0642110201cb412a0d56337a0d6bbb12a0348dd9' 
  AND token = 'xPzpbqkXx3dWWwR9kjYlljKPPbwLW6yySSL4cfQdwrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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