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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11ec6c76cc7d487ad8cb9edd70e22e60c3e223ffbc5b0169f57ef3648e48f1c' 
  AND token = '7D91qh4YHWXMwimUV8w/tku4ZQQcvyqShOwFjcUxYIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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