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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd884f2e6db97e73903c63c7e88c26aca68d83efdf4f75e729a5f5cddd4a5c10' 
  AND token = 'd1YBOTIYjeRmy9WKA4p3JBEuf6UIksN5aWRScdp318k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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