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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd406eda089a5216ceb636be18b8e10b8e831c01abc99972231a6da1a6363376' 
  AND token = 'Hors6+ktUpd//ed/yRWR6P8q+LJliJPqyPYoTJkXN0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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