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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274903f308468a862e71c9af81b3506eb77cae939596634fc9254062a6d72f79' 
  AND token = '8YhhM0wJ7cMt9oiIwXYu2Aqfs7Z8t7BIqHI1QfBXi7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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