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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eadf8af7ce676c4e65c9807327512c40035c0243d3030344bf3d45a8acc97ee' 
  AND token = '1CqsIwGKFoSdJN0LogwbGpcmmbnNBKMMgkImaahIcSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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