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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8986dbf19a729c273fd6f91ae7cdc31b3b9e0e2b0d6ad75c66285bbbdd3a3ba1' 
  AND token = '5HefVKU9plPtG8rLvWY8bvpBx9xWv19qyRi+c6sIAHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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