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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be367da75a229bcda7dd7e9560b798836392c40f5282bff558c932a8e81e8b3' 
  AND token = 'WGdWJDxDEG2TypYRdBdMhgGtGoryqObtLPoAWr0/EgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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