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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fcebeeebb89528f5e6b6573340193f1b0f2594db0da14565bd076b3ad484d6' 
  AND token = 'ASNmqUDJR+kP4CXymrMI9+RU2sebZqthfd49XtB+ivk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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