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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefe21cdda4f3035f2c0176813ceecab8cfa33f59e5e04f244eef341b567ece9' 
  AND token = 'ltEra/wLLsCU44A7tt2Dc78UUcebHgfkG7JcJuuNDTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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