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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a68de30715fd889d8e2e05780984a0bcc6fba9712d727baa1f841eb94847023' 
  AND token = '1kMxpTPuTIzqzVIxLFUZQP2W8WIclhv9PfBE7U7qWwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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