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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c57bc22a1f4a5b90eed9c4594f71e365da55b73b05958f8e23753271b1693d' 
  AND token = 'Lwvo7RfmhZFVSTUmrYephK1A+6da+LZ06cV97kwZe0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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