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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96b39d268f6dfd0d2cfedbb3bb39bb893207b0acb0d095f5e08b924ecb49fe3' 
  AND token = 'JjG1VMMdWFoX18ZnGRVdhIA+5+yggjydWax6mORYLvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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