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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b835c303f421ee347b8295063b4bc26b525f9ad8a3dbbbec5956864516b3ba' 
  AND token = 'hl1F8wrokoWcu9jH5PIQdWw+VLZIuVkilTS0CABXCc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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