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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3f948c2229337cbd95922781c63a60c92429b6b9d4e73c8dd3dc3a6f4adb41' 
  AND token = 'pcOCPafQBTTjf+ke96B5LU5HlO/DySQqGTurFIgRa0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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