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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01be8136f2bfb6233d12df9053ee26ba1bcb944c0e508de266272ba876c444f' 
  AND token = 'le/9nUN5PA/Q3Fx6p0LrMvzUyfuCxQnRzMgGAdX6mIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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