SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2686f3be896ce76053a3e5ec3437e2f4d8b1c2ffe8fcfde2786f71165b5db4ad' 
  AND token = '0KgGWJDVoteqCoNcBZvLfKnZrxG936JvH0qdAqjLKS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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