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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991814beb2b3b56044ad9444d1c6921169a3aa342c4702d22f017e50d210a902' 
  AND token = 'xt/S7Y0FtAdXA1YnVyd0Tiy9KAAcJ7e+1BrdLn14O0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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