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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46663cee9d30ff5b5efa39812ab0b5af09f8009b8982cfaa54194529e381fd2d' 
  AND token = 'SNBO3a3b2g0swXtRwqrqB/Wf4wWMQE+HiLlQ7FZectk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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