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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41b50acf0f1be623e68c3208a63cd022f9ae90ab91640b40c1149f70c74dc55' 
  AND token = 'vR0PUPWxCbF769J6NeRct4EhV+fyBVe5DnMeVCYspxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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