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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fa720acdb258ce35582c143e37e696588e67eb2a10bd975571f4e61a7ff4c2' 
  AND token = 'zPFnkVtuEPwW2B2u1WjXbceQUzlh1mUTW9ywIZUt3tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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