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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32529342ebbed72b2ccc6a8f85c8d1cba2322cb7679168b32cf708263707f135' 
  AND token = '0q5S6vgliADcciy12SELkJvcJcu+9n33RxJhsWg9mZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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