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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605bcbdaf17794105c5e6ee53ec8310b21f06a5c9f241e64b40041915cc9d59f' 
  AND token = 'QunUjOHqnw9JfPCnQtlm08zqkuD4vwXgVobsRyIfwVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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