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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefc81b9ac82518d53c347df0db8595553265a98fa2b03e6dc978a9a45d267bf' 
  AND token = 'aSqUyKIEep8hDiLP/ymf6kHzm84ncIFfo5EmpMutop4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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