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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7356043c5ed770a24f79e9651c520503122990ad915000aa9664e7ad7d7555fa' 
  AND token = 'r+0LspPPKU8feBJr1jkn2gQWCtDSYMs6t0HRNOk77N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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