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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fdca5365745629bf9a7f9f52d18d7ef3a3155d4918ce9f73c738cac83df62d' 
  AND token = 'NmtA4KA5nAbsOKqF65c4wkjIwT9IFdQMJPSaYVb//eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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