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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df9e1f50f87f48b618b0ce1dce242765eed251490651306985b2562cb7f7717' 
  AND token = 'gq6Ed9aqYFLfWmWFL5w+LKFoeNjWBQwSzK5J02HXLoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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