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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17e9d83d7f70c2921a5eaa8d52f68d5a74d8faa6798182a069f2fffc6cb6c67' 
  AND token = '2PWEg8OUNVhimhgyi3+phyp7ZaD69D2wVSaK0N18Uik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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