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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d14da133130fdb04e1a0c2d83652b81afcd5b28ce951728ee2d72a576e488dc' 
  AND token = 'lcgWjwSaDzNQL/E4cQOyzIL7IdEr3YkAbMLcSIm2hMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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