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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a6c79e55d331848fcde6b9233124417e01f7605cd4832fefc66a6009ec43f5' 
  AND token = 'Lz8aJmWAPu754N3aDkl3M0OF1WbLykb7JfBAytUC4Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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