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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce10b9e56c005f4bce1f7ee140ba4f69a373389085b08be6a08c1020e25631d' 
  AND token = 'Ak4SSntJO1aoPcxv7c9Y/evT+0DEqKGMtPXtjbumc/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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