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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f034943e242cea3032ca45167eab245259c6c943b6b6a8e5086e599c34ef0c3' 
  AND token = '8/HSbQ6noZFjobVfdWs3AKJ75UGwXa4Qw0cPyvxIMy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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