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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076f3e49561089e0182ac3ecf2bb612c8a8fdce71bebe0e0fda5aff5e6bc8853' 
  AND token = 'R5LpIEwNCjRohYsoghmkjIkvKAO8XtI2sy8xBrs5WEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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