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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939e4979f4b4820be365775aa3777d3fde95984d96d7d02576bc6caad273a639' 
  AND token = 'TVu4soAEXCB5eMayoWRkdDtCpr/ozJ9dI/iTq+wZR3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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