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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd718284324cd297156b3535e78af9155babe6ca0f58208ebfd8e3543e29288f1' 
  AND token = 'Y+b22CUvMKnVscDbRb67JHL4D2QEpL5mnGhTGo/I920=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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