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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d9facd8f74adb3ebdace41db35399ec9436c49c3b30656baa9b2411e7101e6' 
  AND token = 'OW28H0MeR7dpP0WdCC9dwP0sdzuWEM2m6biWwptxkBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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