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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03609626bca7104db6dcad1c34b8db36a04223f1d7354904be952758e5d4b4d3' 
  AND token = '1gGnE9Govv4EZzntip8VaZzZC5YSiUyk/mSm8D53kck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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