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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5aaa68fd620de1bc380bc17d14e3f2b578f5b4bbf3d959ffb0be6ca96f741b' 
  AND token = 'mcJZY2rYPD19Tveu9WalbgQPfkCQ0uOaUXAZGdrtX8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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