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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3161b0d48cc7dba5a57df834574f9d4fa8b25b1d1670d1a39e3b8b0ec45c306d' 
  AND token = 'Dl6eeGpQuq4stk3EyfxvGINzQ19F6heI6f4U+fh/fJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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