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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fe6a70395d525971d540b12152291430a84f1cf0002cf0fd2cfd51368c6b4c' 
  AND token = 'IhPpZdo6o/czd8dPmz5UyWkJOG3Ee8Eajs+aPloYqLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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