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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79191d3741d286a4bb23a0b8f56409790c161814de7492f448d89555e5b910e7' 
  AND token = 'NHdKvPt5otH4EiO6iElm53Vvm+4CGf71qiZAwY2w30U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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