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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89623d0246054378edb0a995599433f417ae2e13a3f24e15b7205d7cf435e6ae' 
  AND token = 'QdKYG79RJIo4Ta8/4md+rQE/TWik6i2l47rbH7BeKa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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