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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97663a95884b4463f1dfd30f1fae85f66f2e62c2c964f4a3d13f3e619f73a36a' 
  AND token = 'je7X4Z+5SryOGyAZWawsYnpa30wgyz4LWVcWUdf7Tgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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